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Transient focal cerebral ischemia differentially decreases Homer1a and 1b/c contents in the postsynaptic density

Kazutoshi Murotomi1, Norio Takagi, Ayaka Muroyama

  • 1Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.

Neuroscience Letters
|April 3, 2012
PubMed

Insights

Transient cerebral ischemia reduces Homer1a and Homer1b/c protein levels in rat brain synapses. This decrease in Homer proteins may disrupt synaptic function following stroke.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pathophysiology

Background:

  • Homer proteins are crucial scaffold proteins in the postsynaptic density (PSD), regulating synaptic function.
  • Homer proteins bind to group I metabotropic glutamate receptors (mGluRs).
  • The role of Homer proteins during pathophysiological conditions like cerebral ischemia is not well understood.

Purpose of the Study:

  • To investigate the effect of transient focal cerebral ischemia on Homer1 protein levels within the isolated PSD fraction in rats.

Main Methods:

  • Rats were subjected to transient focal cerebral ischemia.
  • Postsynaptic density (PSD) fractions were isolated from cortical homogenates.
  • Levels of Homer1a and Homer1b/c proteins were quantified using Western blotting at different reperfusion times (4h and 24h).

Main Results:

  • Both Homer1a and Homer1b/c, along with group I mGluRs, were found in the cortical PSD.
  • Cerebral ischemia significantly decreased Homer1a levels in the PSD at 4 hours of reperfusion.
  • Homer1b/c levels were reduced in both PSD and homogenates at 24 hours of reperfusion.

Conclusions:

  • Transient cerebral ischemia alters Homer1 protein levels in the PSD.
  • The reduction in Homer1a and Homer1b/c following ischemia may contribute to synaptic dysfunction.
  • These findings suggest a potential role for Homer proteins in the pathophysiology of cerebral ischemia.

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